What are the typical dimensions for a construction trench?

The dimensions provided in the choice indicating 20 m long, 1 m wide, and 2 m deep reflect a common practice in construction, particularly for trenching associated with utilities or foundations.

When evaluating trench dimensions, several factors come into play, including safety, access, and the specific requirements of the project. The length of 20 m is manageable for work crews and equipment while the width of 1 m ensures that the trench can accommodate workers safely while minimizing the risk of collapse. A depth of 2 m is typical for many underground installations, such as drainage, sewer, or utility lines, and it allows for adequate protection against ground shifts or disturbances.

This configuration balances functionality and safety. Wider and deeper trenches could introduce higher risks of collapse and would typically require more extensive shoring and safety measures, thus complicating the work and increasing costs without enhancing the efficacy of the excavation.

In contrast, the other choices tend to deviate from typical trench dimensions either in width or depth. For instance, wider or deeper trenches can introduce additional challenges, including increased risks and potential regulatory considerations regarding excavation safety.